唯識二十論述記 2.166

2.166

陳那以前古內、外道，大、小乘師皆說三量：一、現量；二、比量；三、聖言量。今依梵音，云：阿弗多阿笈摩，此云至教。至教量者非得，但聖者說，名為至教。但是世間言無差二可信者語，皆至教量，契至理故，合實事故，如八語品，四聖言等。

Prior to Dignāga, ancient non-Buddhists and Buddhists, both Mahāyāna and Hīnayāna masters, all spoke of three means of cognition: first, direct perception (pratyakṣa); second, inference (anumāna); third, verbal testimony of the sages (śabda-pramāṇa). Now, according to the Sanskrit, it is called āptāgama, translated here as 'authoritative teaching' (āptāgama). The means of cognition of authoritative teaching is not [merely what one] attains, but what the holy ones have spoken, which is called authoritative teaching. Whenever worldly words are unerring, not of two kinds, and worthy of trust, they are all the means of cognition of authoritative teaching, because they accord with ultimate truth and conform to real facts, like the chapter on the eight kinds of speech, the four noble statements, and so forth.